because you see skinny girls wearing cute dresses and doing their hair a certain way, and its embedded into your mind so well that you don't even realize what its doing to you. and if you feel flabby at a certain moment or you realize your clothes don't like like the clothes that the girl in the magazine is wearing, you go out and buy clothes and makeup and gym memberships in order to look like what you see. and many can deny it, but that's the only plausible explanation as to why so many girls have the same hair style and are wearing the same kind of clothes and makeup.
